"I was intending to connect the AMP to the rear light feed so that the amp will be powered only when i turn the lights on... (this is to avoid cranking and speaker pop) Will this work."
It would probably work for about 2 mins, and then you'll fry something. The power wire to your amp should be heavy gauge straight from the battery. Amps suck a lot of power, and that much power travelling through the tiny wires in your lights will most likely melt. But knock yourself out. Other than that, you can answer the rest of the questions yourself just by searching the forum. It's all in there.